package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import io.lettuce.core.BitFieldArgs;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 程曼佳
 * @since 2025-9-7
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result setCode(String phone, HttpSession session) {
        // 1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误！");
        }
        // 3.符合 生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 4. 保存验证码到redis中 2分钟有效期
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 5.发送验证码
        log.debug("发送验证码成功，验证码："+code);
        return  Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误！");
        }
        // 2.校验验证码 从redis获取
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)){
            return Result.fail("验证码错误");
        }
        // 4. 一致 根据手机号查询用户
        User user = query().eq("phone",phone).one();
        if(user == null){
            user = createUserWithPhone(phone);
            save(user);
        }
        //生成token
        String token =UUID.randomUUID().toString(true);
        //得到部分用户信息
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //bean转hashmap存到redis 参考session有效期 30min
        String tokenKey = LOGIN_USER_KEY+token;
        //因为stringRedisTemplate只支持存储String 需要在bean转map时将每个字段都转为String类型
        stringRedisTemplate.opsForHash().putAll(tokenKey, BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString())));
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL,TimeUnit.MINUTES);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //获取当前用户和当前日期
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        int dayOfMonth = now.getDayOfMonth()-1;
        //写入redis bitmap
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth,true);
        return Result.ok();


    }

    @Override
    public Result signCount() {
        //获取当前用户和当前日期
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        int dayOfMonth = now.getDayOfMonth();
        //获取本月截至今天为止的所有签到记录 返回十进制
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if(result==null||result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null||num==0){
            return Result.ok(0);
        }
        int count = 0;
        while (true){
            if((num&1)==0){
                break;
            }else {
                count++;
            }
            num>>=1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        return user;
    }
}
